#login-container {
    height: calc(100% - 50px);
    display: flex;
    justify-content: center;
    align-items: center;
}

#login-form {
    width: 400px;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 10px;
    /* 上右下左 */
    padding: 50px 50px 100px 50px;
}
#login-form>h3 {
    text-align: center;
    margin-bottom: 50px;
}
#login-form>.login-row {
    height: 50px;
    display: flex;
}
#login-form>.login-row>span {
    height: 40px;
    line-height: 40px;
    width: 100px;
    font-weight: 500;
}
#username,
#password {
    height: 40px;
    width: 200px;
    border-radius: 5px;
    border: none;
    outline: none;
}
#submit {
    width: 100%;
    height: 40px;
    background-color: green;
    color: white;
    border-radius: 5px;
    border: none;
}
#submit:active {
    background-color: gray;
}
